Health & Fitness
Infant Dehydration by Weight Loss
Estimate dehydration severity and fluid deficit from acute weight loss and clinical signs.
Preparing your result…
What this calculator does
Calculates Infant Dehydration Assessment Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Dehydration % = 100 × (pre-illness weight − current weight) ÷ pre-illness weight; fluid deficit (mL) ≈ weight lost (kg) × 1,000
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Estimated dehydration %=100×(pre-illness kg−current kg)/pre-illness kg. Corresponding fluid deficit mL≈1000×weight loss kg=pre-illness kg×dehydration percentage number×10.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Original needs to derive the percentage from the supplied two weights. Use a recent reliable pre-morbid weight; distinguish percent number 5 from fraction 0.05. Clinical signs and severity require assessment; this deficit is not by itself a rehydration rate, bolus or maintenance prescription. Neonatal weight changes need their own context.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Recent pre-illness weight (kg) | Current weight (kg) | Estimated dehydration |
|---|---|---|---|
| Worked example | 10 | 9.5 | 5 % |
| Half the amounts | 5 | 4.75 | 5 % |
| Double the amounts | 20 | 19 | 5 % |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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